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conf: add possibility to evaluate simple integer math expressions

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It is useful to use the math expressions for the values in configuration.
This patch adds a simple expression evaluation routines (integer only).
The syntax is simplified unix shell (bash) style.

Examples:

	$[1 + 1]
	$[$[2 + 2] / $var1]
	$[0xa0 | 0x05]

As a bonus, the variable substitutions were more abstracted.
The function snd_config_expand_custom() was introduced to be used
for example in the topology pre-precessor.

Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2021-11-29 14:57:29 +01:00
parent 32d332b786
commit bf528b9066
5 changed files with 389 additions and 18 deletions
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7
include/conf.h
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@ -108,11 +108,18 @@ int snd_config_search_definition(snd_config_t *config,
const char *base, const char *key,
snd_config_t **result);
typedef int (*snd_config_expand_fcn_t)(snd_config_t **dst, const char *s, void *private_data);
int snd_config_expand_custom(snd_config_t *config, snd_config_t *root,
snd_config_expand_fcn_t fcn, void *private_data,
snd_config_t **result);
int snd_config_expand(snd_config_t *config, snd_config_t *root,
const char *args, snd_config_t *private_data,
snd_config_t **result);
int snd_config_evaluate(snd_config_t *config, snd_config_t *root,
snd_config_t *private_data, snd_config_t **result);
int snd_config_evaluate_string(snd_config_t **dst, const char *s,
snd_config_expand_fcn_t fcn, void *private_data);
int snd_config_add(snd_config_t *config, snd_config_t *child);
int snd_config_add_before(snd_config_t *before, snd_config_t *child);